<mat-selection-list dense #sss>
  <mat-list-option *ngFor="let item of items" [value]="item" [title]="item.name"
                   [selected]="selected.includes(item.id)">
    {{item.name}}
  </mat-list-option>
</mat-selection-list>

<button mat-button (click)="onClick()">刷新</button>
<button mat-button (click)="onSelect0()">选择</button>
